Q: Do you mind books with similar ideas to other books? Similar concepts, backgrounds, retellings or pulled-to-publish fanfic?
A: Well, it depends on the book or author. Recently, I'm sure most people have heard, that a big publishing house signed a Twilight fan-fiction author to a two-book deal. That deal, in my opinion, was just to sell books and nothing else.
However, after saying that, I do enjoy Jane Austen fiction and spinoffs. It is called Austenesque fiction. Stephanie Barron writes a wonderful mystery series where Jane Austen is the sleuth. They are a lot of fun to read.
In the end, it depends on the book and author. There are some that deserved to be imitated (which is the best form of flattery) and others do not. It is up so us to decide which is which.
And I now I'm stepping down from my little soapbox!